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Elevation in boiling point of an aqueous...

Elevation in boiling point of an aqueous solution of urea is `0.52 ^@C( K_(b) "for water"=0.52K"molality"^(-1))`. The mole fraction of urea in this solution is :

A

`0.982`

B

`0.018`

C

`0.0567`

D

`0.943`

Text Solution

Verified by Experts

The correct Answer is:
B
`0.52 = 0.52 xx m`
`m = 1` i.e., solution is 1m
Thus, the solution contains 1 mol of urea in `1000g (55.5mol)` of water
`:. x = (1)/(1+55.5) + (1)/(56.5) = 0.0177`
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